17
Models
Revision 03-2012
Toucan 1210
Toucan 1310
Hydraulic circuit pollution
- A
BRASIVE
WEAR
CAUSED
BY
ABRASIVE
PARTICLES
Such a wear results in a gradual reduction of the
power and speed of the hydraulic circuit.
Fine particles may enter the circuit:
• During reservoir filling (clean the area around the
filling neck before opening the cap. Use clean
containers and funnels during filling procedure).
• Through worn seals, particularly on dirty and poorly
maintained material.
• During maintenance if components are not capped
after hose disconnection.
HYDRAULIC SYSTEM
3
3
-
A
BRASIVE
WEAR
CAUSED
BY
METALLIC
PARTICLES
.
Such a wear results in a fairly sudden degradation of
the performances of the pump. Metallic particles result
generally from the degradation of a component or from
an abnormal wear of the hydraulic circuit: the
component must be identifed and replaced. Every
hydraulic component must be removed and cleaned.
The hydraulic circuit must be drained out and flushed
and the filters changed.
- A
ERATION
OR
CAVITATION
Cavitation and aeration act alike in the system.
Aeration occurs when air mixes with the oil. Air may
enter the system through a small suction leak or by
agitation of the oil in the reservoir. Agitation occurs
when the oil returns to the reservoir above the oil
surface. This may occurs when the oil level is too
low. Cavitation is the formation and collapse of vapour
bubbles in the oil. This usually results from a restricted
pump suction. Cavitation occurs more readily when
the oil is cold.
Aeration and cavitation erode and pit the pressure
plates and pump housing.
A pump which is either cavitating or operating on
aerated fluid is usually noisy and the system operates
in a spongy or jerky manner.
If erosion on the suction side of the pump is evident on
the gear tracks, the cause is either air bubbles in the
oil or a restricted suction.
Bearing wear
(dull area)
Wear on pinion pressure
plates (dull area)
Wear on gear track (dull
area)
Wear on gearing track
(grooves)
Bearing wear
(grooves)
Wear on pinion
pressure plates
(grooves)
Cavitation
Track grooved on suction side = overpressure
